The first new move in the game. Of course it's very natural to double rooks on the f-file, but it's probably even better to maneuver the knight immediately.
14. e5f6  14... f8f6  15. c1e3  15... c8d7 One of many possible moves. 16. f1g1 The best move. White shouldn't be in a hurry to capture on e4.